Growing in dense thickets with bamboo like stems Japanese Knotweed, Fallopia japonica, is an invasive and often destructive perennial. Introduced in the early 19th century as an ornamental plant, it is now common and widespread across the UK.
It does not produce viable seed and is spread by the dispersal of fragments of stem or rhizomes. The dense growth smothers the local flora, and may cause structural damage erosion and flooding along watercourses.
Information and Identification Sheets:
SNH Species Action Framework: Invasive non-native plants associated with fresh waters. A Guide to their identification